Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 92, NWS Grand Forks, ND

June 29, 2001Grant County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 29, 2001, 8:29 PM CDT for Grant County, Minnesota. It was in force for 31 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued
Jun 29, 2001, 8:29 PM CDT (01:29 UTC)
Expired
Jun 29, 2001, 9:00 PM CDT
In force
31 min
Issued by
NWS Grand Forks, ND
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Grant County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 202 km from the middle of the area, began a volume at 01:33 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Jun 29, 9:02 PM CDTHail 0.75Evansville, MN

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.5 hours before the alert went out and 217 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2001-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1235 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2001-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1235 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
1556 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
67 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KFGF 300129
SVRFAR
MNC051-300200-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS
829 PM CDT FRI JUN 29 2001

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN GRANT COUNTY IN WEST CENTRAL MINNESOTA...

* UNTIL 900 PM CDT

* AT 827 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER ASHBY...OR ABOUT 17 MILES SOUTHEAST OF
  FERGUS FALLS...MOVEMENT WAS TO THE SOUTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ERDAHL AT 850 PM CDT...

REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

LAT...LON 4611 9579 4610 9594 4594 9586 4597 9561


$$



NNNN

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 29, 2:10 PM CDT, 6 hours 19 minutes earlier.

Area forecast discussion, Jun 29, 2:10 PM CDT, 6 hours 19 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
210 PM CDT FRI JUN 29 2001

FORECAST CHALLENGE WILL BE TEMPS AND PRECIP CHANCES

.OVERVIEW...
LATEST SFC ANALYSIS SHOWS WEAK FRONT/TROUGH PUSHING EAST INTO MN
SIDE OF FA. SLIGHT DEWPOINT COOLING IS NOTED BEHIND FEATURE...AS
THEY DROP INTO THE LOWER 60S. ETA DID A BIT BETTER JOB INITIALIZING
MASS FIELDS...WITH AVN NOT TOO FAR BEHIND.

.SHORT TERM...
CONCERN THIS EVENING IS CONVECTIVE POTENTIAL IN EASTERN FA. TROUGH
IS PROGRESSING A LITTLE FASTER THAN MODELS HAVE PROGGED. THIS SHOULD
LIMIT SFC CONVERGENCE AS A WEST/NORTHWEST FLOW DEVELOPS AND TROUGH
AND DEVELOPING CONVECTION MAKES IT OUT OF FA AROUND 21Z. EVEN THOUGH
A 50KT SPEED MAX WILL RIDE INTO AREA AFTER 00Z...FEEL ANY SFC
FORCING WILL BE LOST WITH TROUGH PASSAGE. IN ADDITION...850MB
DEWPOINTS DRY TO AROUND +9C THIS EVENING. INSTABILITIES ALSO DROP
AFTER 00Z...SO EXPECT A DRY EVENING AND OVERNIGHT. WINDS WILL BECOME
LIGHT NORTH AFTER 06Z...COUPLED WITH RESIDUAL MOISTURE COULD LEAD TO
PATCHY FOG...ESPECIALLY IN SOUTH AND EAST WHERE HIGHER DEWPOINTS
WILL BE. WILL MENTION FOG IN HERE FOR THIS REASON.

.LONG TERM...
SIGNIFICANT COLD FRONT DROPS INTO REGION TOMORROW FROM NORTH. 850MB
TEMPS COOL TO AROUND +6C ACROSS THE NORTH...WITH THE SOUTH MUCH
WARMER AT +14C. WITH THE PASSAGE OF FRONT...AND RIGHT ENTRANCE
REGION OF 110KT 300MB SPEED MAX...EXPECT SCATTERED SHOWERS ACROSS
NORTH WHERE INSTABILITY WILL BE LIMITED. EXPECT PLENTY OF CLOUDS AS
WELL WITH CONVECTIVE TEMPS IN THE MID 60S...ANY SUNSHINE SHOULD SELF
DESTRUCT. FROM GFK SOUTH...CAPES AROUND 600 J/KG WITH LI/S TO -4C
WILL PREVAIL AFTER 18Z. IN ADDITION...SFC DEWPOINTS WILL BE AROUND
60F WITH 850MB DEWPOINTS POOLING AHEAD OF FRONT AROUND +10C. EXPECT
THUNDERSTORM DEVELOPMENT ALONG GOOD SFC CONVERGENCE NEAR FRONT BY
AFTERNOON. WITH WET BULB ZERO LEVELS DROPPING TO 9500FT...WOULD NOT
RULE OUT SOME ISOLATED SEVERE STORMS WITH LARGE HAIL. WEAK
SUBSIDENCE WILL BUILD IN SAT NIGHT BEHIND DEPARTING SHORTWAVE
PASSING NORTH OF BORDER. RELATIVE HUMIDITY PROGS SHOW DRIER AIR
WORKING INTO NORTHERN FA AS HIGH CONTINUES TO BUILD INTO ARROWHEAD.
850MB TEMPS ALSO DROP TO AROUND +2C IN NORTH...SO EXPECT TEMPS BELOW
NORMAL. TO THE SOUTH...FRONT WILL LINGER IN SOUTH DAKOTA AND EXPECT
MORE CLOUDS CLOSER TO RETURN FLOW. ON SUNDAY...LOW LEVEL JET
DEVELOPS IN WESTERN NORTH DAKOTA. SHOWALTER/S DROP TO AROUND -2C IN
WESTERN FA BY 00Z MON. STRONG 850MB WARM AIR ADVECTION MOVES INTO
THE RED RIVER VALLEY SUNDAY AFTERNOON. IN ADDITION...STRONG LIFT IN
THE 850-700MB LAYER RESULTS AHEAD OF 500MB SHORTWAVE WHICH SHOULD
AID ELEVATED CONVECTION. EXPECT SHOWERS BY LATE IN THE DAY SUNDAY IN
EASTERN FA...WHERE STABLE AIR WILL HANG ON ALL DAY. TEMPS WILL BE
COOLEST IN THE NORTHEAST...CLOSER TO DEPARTING HIGH.

EXTENDED...LONG RANGE MODELS IN PRETTY GOOD AGREEMENT...WITH MRF
TIMING COMPROMISE...SO UTILIZED FOR FORECAST. UPPER LEVEL NW FLOW
DOMINATES THROUGH EXTENDED WITH A SHORTWAVE AND SFC FRONT MOVING
THROUGH CWFA ON MON...SO KEPT CHC TSRA. UPPER LEVEL LOW AND
ASSOCIATED TROF MOVE THROUGH CWFA TUE NIGHT THROUGH WED...KEEPING
CYCLONIC FLOW OVER CWFA ON WED...SO ADDED CHC TSRA TO FORECAST. SFC
HIGH THEN BUILDS IN FOR THU AND FRI...SO KEPT DRY. AS FAR AS
TEMPS...FMR AND MEX SIMILAR...KEEPING TEMPS IN NORMAL TO SLIGHTLY
BELOW NORMAL RANGE.

.FGF...NONE.

KELLENBENZ/NG

In the hours before

Local storm report, Jun 29, 8:26 PM CDT, 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
826 PM CDT FRI JUN 29 2001

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0710 PM    5 W AMOR                  MN   90 MPH TSTM GUST
06/29/01   OTTER TAIL                     ESTIMATED REPORT BLEW
                                          SHINGLES OFF THE ROOF AND
                                          BLEW A 8X8 FT FISH HOUSE
                                          150 YARDS

0715 PM    4 NW AMOR                 MN   1 INCH HAIL
06/29/01   OTTER TAIL

0721 PM    2 W AMOR                  MN   .75 INCH HAIL
06/29/01   OTTER TAIL

0803 PM    7 SW BATTLE LAKE          MN   .88 INCH HAIL
06/29/01   OTTER TAIL                     HAIL OF VARYING SIZE FELL
                                          FOR OVER 20 MINUTES

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 29, 7:17 PM CDTSevere Thunderstorm WarningFGFOtter Tail43 min
Jun 29, 7:58 PM CDTSevere Thunderstorm WarningFGFOtter Tail47 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2001Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.